My brand new 2007 ktm 250sx got about 15 hours on it before I had my first kid, then I had my second. It was running fine. Over the course of the following years it only got a few hours but it ran fine. I've just started riding it again and it is killing plugs. It starts fine. I ride for about 10 minutes. If I stop it will not start again. When I check the plug there is no spark. Sometimes after about ten minutes is just stops while I'm riding. I have done all the usual. New Fuel, carby and float clean, factory settings on air screw and jet and needle. I leaned it right off as per manual to 60:1. When I put a new plug in it kicks first time then the plug dies again either as I'm riding or won't start again after stopping. The plugs never work again? The bike has very low hours on it. I hope someone has some ideas. Thanks.